// Ninf-G-XX, ver. 0.1
// Copyright 2011 National Institute of Advanced Industrial Science and Technology
// 
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// 
//     http://www.apache.org/licenses/LICENSE-2.0
// 
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#ifndef __FP_INPUT_STREAM_H__
#define __FP_INPUT_STREAM_H__

#include <cstdio>
#include <string>
#include "InputStream.hpp"

using namespace ninf::lib;
class FpInputStream : public InputStream {
  FILE * fp;
  bool   closed;

	void init(const char * filename);
public:
  /* constructor */
  FpInputStream(FILE * fp);

  FpInputStream(const char * filename);
	FpInputStream(const std::string & filename);

  ~FpInputStream();

  /**
   * read a single byte 
   * if it encounters EOF returns -1
   * if it encounters some error throws exception
   */
  int read();

  /*
   * read byte array and stores it to val 
   * it returns number of actually read bytes
   */ 
  int read(char * val, int offset, int len);

  /*
   * read byte array and stores it to val 
   * keep tring to read specified length
   * returns non 0 if succuess, 0 if failed
   */ 
  int readFully(char * val, int offset, int len);

  /*
   * close underlying stream
   */ 
  void close();


};



#endif
